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Northwest Africa 14657
Basic information Name: Northwest Africa 14657
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14657
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 163.9 g
Classification
  history:
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 280 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 3 Apr 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 14657 (NWA 14657)

(Northwest Africa)

Purchased: 2021

Classification: Lunar meteorite (feldspathic breccia)

History: Purchased by Edwin Thompson in early 2021 from a meteorite dealer in Adrar, Algeria. Subsequently acquired in May 2021 by Cascadia as part of a trade.

Physical characteristics: Single stone with nearly absent fusion crust.

Petrography: (D. Sheikh, H. Babst, Cascadia) Sample displays a brecciated texture composed of lithic clasts (most mm-sized, up to ~1 cm), mineral clasts, and isolated mineral fragments set within a fine-grained matrix containing glassy melt pockets and fractures. Various anorthositic clast lithologies (ferroan anorthosite, magnesian-suite anorthosite, and hyper-ferroan, as found in ALHA 81005, Dhofar 302, Dhofar 081, and NEA 001 by Gross et al. (2014) were identified in this sample. Accessory phases include ilmenite, apatite, silica, troilite, ülvospinel (some Cr-bearing), and Fe-Ni metal. Some plagioclase grains have been transformed into maskelynite.

Geochemistry: Olivine (Fa34.1±8.1, range Fa19.9-40.4, Fe/Mn=87±6, n=26), Low-Ca Pyroxene (Fs24.3±6.0Wo3.2±1.1, range Fs16.6-29.8Wo0.3-4.5, Fe/Mn=51±4, n=12), Pigeonite (Fs40.3±11.8Wo13.5±5.7, range Fs22.2-58.4Wo5.6-23.4, Fe/Mn=55±5, n=17), Augite (Fs22.4±8.0Wo35.2±5.7, range Fs11.4-36.0Wo27.2-44.8, Fe/Mn=51±8, n=7), Calcic Plagioclase (An96.5±0.7, range An94.9-97.7, n=45); Ferroan anorthosite clasts (Mg#=64.2±2.1, An96.7±0.3, n=3), Magnesian-suite anorthosite clast (Mg#=80.8, An95.9, n=1), Hyper-ferroan clasts (Mg#=37.4±5.8, An96.8±0.7, n=2).

Classification: Lunar (feldspathic fragmental breccia)

Specimens: Cascadia holds 149.8 g (main mass) in two pieces, in addition to 1 polished thin section; 11.6 g at UAb.

Bibliography:
  • Gross J., Treiman A. H. and Mercer C. N. (2014) Lunar feldspathic meteorites: Constraints on the geology of the lunar highlands, and the origin of the lunar crust. Earth and Planetary Science Letters 388, 318–328. (link)
Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Algeria
Date:P 2021
Mass (g):163.9
Pieces:1
Class:Lunar (feldsp. breccia)
Shock stage:high
Weathering grade:low
Fayalite (mol%):34.1±8.1
Ferrosilite (mol%):24.3±6.0, 40.3±11.8, 22.4±8.0
Wollastonite (mol%):3.2±1.1, 13.5±5.7, 35.2±5.7
Classifier:D. Sheikh, H. Babst, M. Hutson, A. Ruzicka, R. Hugo, Cascadia
Type spec mass (g):149.8
Type spec location:Cascadia
Main mass:Cascadia
Comments:CML 1409; submitted by Daniel Sheikh
Institutions
   and collections
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
UAb: 1-26 Earth Sciences Building, University of Alberta, Edmonton, AB, T6G 2E3, Canada, Canada; Website (institutional address; updated 17 Oct 2011)
Thompson: Edwin Thompson, 5150 Dawn St., Lake Oswego, OR 97035, United States (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
Daniel Sheikh   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8559 approved meteorites from (Northwest Africa) (plus 1896 unapproved names)

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